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Optically stimulated luminescence (OSL) dating of quartz sand (106–150 or 150–200μm) in bioclastic carbonate–quartz sediments sampled from coastal relict foredunes (beach ridges) was undertaken to evaluate the utility of the OSL method for studies of dune dynamics and to quantify rates of coastal progradation. Twelve sediment samples from a 4km transect across a Holocene embayment fill at Guichen Bay, South Australia, were measured for their luminescence characteristics. Apart from one age inversion attributed to recent disturbance associated with mining, the OSL ages are in sequential order when considered in the context of their associated error terms. The OSL ages indicate an extremely rapid initial phase of sedimentation (i.e. 1600m within a few hundred years, approximately 5ka ago) followed by a constant rate of progradation for the past 4ka of 0.39m/a, with a high level of association between …